Preparation method of high temperature resistant vanadium tungsten titanium oxide catalyst

An oxide, vanadium-tungsten-titanium technology, applied in the field of preparation of vanadium-tungsten-titanium oxide catalysts, can solve the problems of poor thermal stability at high temperature, narrow catalyst operating temperature window, uneven distribution of active components, etc., to achieve good water resistance Effects of sulfur and thermal stability, excellent N2 generation selectivity

Inactive Publication Date: 2014-11-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vanadium-based NH prepared by the traditional impregnation method 3 -SCR catalyst, mostly TiO 2 as the carrier, and then load a certain amount of V 2 o 5 、WO 3 and other components, while multi-component impregnation will produce

Method used

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  • Preparation method of high temperature resistant vanadium tungsten titanium oxide catalyst
  • Preparation method of high temperature resistant vanadium tungsten titanium oxide catalyst
  • Preparation method of high temperature resistant vanadium tungsten titanium oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to W / Ti molar ratio is 1.0, ammonium tungstate is dissolved in titanium sulfate solution, continuously stirs until ammonium tungstate dissolves completely, then adds excess precipitating agent urea in this solution, and in 90 o Under the condition of C, keep stirring for 12 h, then perform suction filtration and washing, and then put the obtained solid in an oven at 100-110 o C drying 12 h, muffle furnace at 500 o C roasting in air for 5 h to obtain a powdery solid, and then ammonium metavanadate and powdery solid according to V 2 o 5 Loading capacity is 1 wt%, add water, mix and stir for 1 h, rotate the mixture until the water volatilizes completely, put the obtained solid in an oven at 100-110 o C drying 12 h, muffle furnace at 500 o C was calcined in air for 5 h to obtain a powdered catalyst, called catalyst A.

Embodiment 2

[0037] Other conditions were the same as in Example 1, and the W / Ti molar ratio was 2.0 to obtain catalyst B.

Embodiment 3

[0039] Other conditions were the same as in Example 1, and the W / Ti molar ratio was 3.0 to obtain catalyst C.

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Abstract

The invention discloses a preparation method of a high temperature resistant vanadium tungsten titanium oxide catalyst for ammonia selective catalytic reduction of nitrogen oxides. The preparation method comprises the following steps: preparing tungsten titanium compound oxide as a catalyst carrier through a homogeneous precipitation method; loading vanadium oxide onto the tungsten titanium compound oxide through dip-molding and calcining to obtain the vanadium tungsten titanium oxide catalyst. The catalyst prepared through the preparation method has the characteristics of excellent catalytic activity, high temperature resistance, thermal stability, high N2 generation selectivity and being adaptive to high idle speed reaction conditions, and is applicable to nitric oxide catalytic purification devices of a mobile source represented by diesel vehicle tail gas and a stationary source represented by smoke of a coal burning power plant.

Description

technical field [0001] The invention discloses a preparation method of a catalyst, in particular a preparation method of a vanadium tungsten titanium oxide catalyst used for catalytic purification of nitrogen oxides. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) is an important air pollutant, which can cause environmental problems such as acid rain and photochemical smog, and can also cause direct harm to the human respiratory system. In addition, it has also made an important contribution to the increasingly serious haze pollution in my country. Therefore, effective control of NO x Emissions are a major strategic demand of our country. [0003] NO x Emission control is divided into stationary source flue gas denitrification and mobile source NO x emission control. In my country's energy structure, coal still occupies a dominant position, and this status quo is difficult to change in the near future. x Emission control is sti...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 单文坡兰益黄海丽杨士建张晋华张彤朱鹏飞袁也欧阳志宇
Owner NANJING UNIV OF SCI & TECH
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